JP6530987B2 - Power converter - Google Patents

Description

  The present invention relates to a power converter, and more particularly to a power converter suitable for connecting a plurality of capacitors in parallel to a direct current unit.

  The power conversion device converts direct current power into alternating current power or converts alternating current power into direct current power using a power semiconductor element. That is, power conversion is performed by turning on and off the power semiconductor element. Generally, in a power conversion apparatus, power is temporarily stored by a capacitor for the purpose of smoothing or the like in the process of power conversion.

  The high-withstand voltage and large-capacitance capacitors are internally connected with multiple capacitor elements in series and in parallel to achieve high-withstand voltage and large capacity.

  In a high-voltage, large-capacity power converter, a plurality of high-breakdown-voltage, large-capacity capacitors for smoothing the voltage are connected in parallel in the direct current portion.

  When a plurality of capacitors are connected in parallel, an LC parallel resonance path is formed by the capacitances of the plurality of capacitors, the wiring inductance inside the capacitors, and the wiring inductance of the conductor for connecting the plurality of capacitors in parallel.

  The technology of such a power conversion device is described, for example, in Japanese Patent Laid-Open No. 2015-002564.

  The current flowing from the power conversion circuit to the capacitor includes harmonics of the switching frequency component of the power conversion circuit, and the above harmonic frequency is the resonance frequency of the LC parallel resonance path between the plurality of capacitors connected in parallel. If it is close, resonance current may flow between a plurality of capacitors connected in parallel, and the current flowing through the capacitors may become excessive.

  An object of the present invention is to provide a power converter capable of suppressing the flow of resonance current between a plurality of capacitors connected in parallel.

JP, 2015-002564, A

  In the above-mentioned prior art, a conductor plate is disposed near the power semiconductor element to suppress the surge voltage by reducing the wiring inductance between the power semiconductor element and the capacitor and the wiring inductance in the arrangement direction of the power semiconductor element. Although the method is disclosed, the method for preventing the generation of the resonance current between the plurality of capacitors connected in parallel is not disclosed.

  In order to solve the above problems, according to the present invention, a capacitor element is connected to a semiconductor element, and the capacitor element is constituted by a plurality, and a wiring conductor on the positive electrode side connecting the positive electrodes of the plurality of capacitor elements. And a wiring conductor on the negative electrode side connecting the negative electrodes of the plurality of capacitor elements, and a conductor plate is disposed close to one or both of the wiring conductor on the positive electrode side and the wiring conductor on the negative electrode side. Configured.

  Specifically, the insulating case contains the wiring conductor on the positive electrode side connecting the plurality of capacitor elements and the positive electrodes of the plurality of capacitor elements and the wiring conductor on the negative side connecting the negative electrodes of the plurality of capacitor elements. A conductor plate is disposed close to a capacitor provided with a positive electrode terminal and a negative electrode terminal outside.

  According to the present invention, it is possible to prevent the capacitor current from becoming excessive due to the LC parallel resonance between the parallel capacitors.

The circuit system example of 1st Embodiment of the power converter device 13 by this invention. The mounting structure of 1st Embodiment of the power converter device 13 by this invention. The front view of the internal structure of the capacitor | condenser 1. FIG. The back view of the internal structure of the capacitor | condenser 1. FIG. The circuit diagram which looked at the capacitor | condenser 1 from the left side. Explanatory drawing of the wiring inductance reduction principle inside the capacitor | condenser 1 by the conductor board 4. FIG. The example which made the conductor board 4 of FIG. 2 annular. Explanatory drawing of the wiring inductance reduction principle inside the capacitor | condenser 1 by the cyclic | annular conductor board 4. FIG. An example in which the conductive plate 4 of FIG. 6 is an example in which the conductor plate 4 of FIG. 2 is disposed in proximity to and in parallel with a portion connecting the capacitor element 5 to the capacitor element 7 of the wiring conductor 8 on the positive electrode side. Explanatory drawing of the wiring inductance reduction principle inside the capacitor | condenser 1 by the conductor board 4 in FIG. 2nd Example of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following examples show one embodiment of the present invention, and the present invention includes other embodiments unless they depart from the scope of the present invention.

  In the first embodiment, an embodiment of the present invention will be described with reference to FIGS.

  First, an example of a circuit system of the first embodiment of the power conversion device 13 according to the present invention, an example of a mounting structure, an example of an internal structure of a capacitor, and a circuit inside the capacitor will be described. Finally, effects and principles of the change in the shape and arrangement method of the conductor plate 4 according to the first embodiment will be described.

  FIG. 1 is a diagram showing an example of a circuit system of a first embodiment of a power conversion device 13 according to the present embodiment.

  In FIG. 1, the power conversion circuit 10 is a three-phase PWM converter, and a positive electrode side for connecting a plurality of capacitors in parallel to a direct current unit (between the connection terminal 110 on the positive electrode side and the connection terminal 111 on the negative electrode side of the power conversion circuit) The capacitor 1 and the capacitor 11 are connected in parallel by a wiring conductor 113 on the negative electrode side for connecting the wiring conductor 112 and a plurality of capacitors in parallel.

  The alternating current power supply 301 (U phase) includes the power semiconductor element 12 (upper side, U phase) and the power semiconductor element 12 (lower side, U) through the AC terminal 114 (U phase) and the AC reactor 304 (U phase). Connected to the phase) connection point. AC power supply 301 (V phase) and AC power supply 301 (W phase) are similarly connected.

  Here, the power semiconductor device 12 (upper side, U phase), the power semiconductor device 12 (lower side, U phase), the power semiconductor device 12 (upper side, V phase), the power semiconductor device 12 (lower side, V Phase), power semiconductor element 12 (upper side, W phase), and power semiconductor element 12 (lower side, W phase) respectively receive control signals from a control device (not shown) and perform on / off operation to Convert the AC power of the

  Power semiconductor element 12 (upper side, U phase) and power semiconductor element 12 (lower side, U phase) are connected in series, and the positive electrode side is connected to output terminal 117 via connection terminal 110 and wiring conductor 112. The negative electrode side is connected to the output terminal 118 via the connection terminal 111 and the wiring conductor 113. The output terminal 117 and the output terminal 118 are connected to both ends of the load 307 in the same manner as the power semiconductor element 12 (V phase) and the power semiconductor element 12 (W phase).

  The wiring conductor 112 on the positive electrode side includes an inductance 30 and a wiring resistor 50 (theoretical configuration), a positive electrode terminal 2 (the power conversion circuit side), an inductance 31 and a wiring resistor 51 (theoretical configuration), and a positive electrode terminal 2 (the load side) It consists of). The wiring conductor 113 on the negative side includes an inductance 35 and a wiring resistance 55 (theoretical configuration), a positive terminal 3 (power conversion circuit side), an inductance 34 and a wiring resistance 54 (theoretical configuration), and a positive terminal 3 (load side) It consists of).

  Capacitor 1 is connected between positive electrode terminal 2 (power conversion circuit side) and negative electrode terminal 3 (power conversion circuit side), while capacitor 11 is connected between positive electrode terminal 2 (load side) and negative electrode terminal 3 (load side). Is connected.

The capacitor 1 theoretically comprises an internal inductance 32, a resistor 52 and a capacitance 70. The capacitor 11 is theoretically composed of the internal inductance 33, the resistor 53, and the electrostatic capacitance 71. In FIG. 1, although the power conversion circuit 10 is a three-phase PWM converter, this is a circuit of the power conversion device 13. An example of the scheme is shown, and the circuit scheme of the power conversion device according to the present invention is not limited to FIG.

  FIG. 2 shows the mounting structure of the first embodiment of the power conversion device 13 according to the present invention. In FIG. 2, a plurality of positive-side wiring conductors 112 and a plurality of capacitors are connected in parallel for connecting a plurality of capacitors in parallel to the direct current portion (between the positive-side connection terminal 110 and the negative-side connection terminal 111 of the power conversion circuit). An example is shown in which the conductor plate 4 is disposed close to the capacitor 1 and the capacitor 11 which are connected in parallel by the wiring conductor 113 on the negative electrode side. That is, the conductor plate 4 is disposed between the capacitor 1 and the capacitor 11. Furthermore, the conductor plate 4 is disposed on the side opposite to the capacitor 1 in the capacitor 11. The wiring conductor 112 on the positive electrode side for connecting a plurality of capacitors in parallel and the wiring conductor 113 on the negative electrode side for connecting a plurality of capacitors in parallel function as wiring inductance and wiring resistance.

  A front view of the internal structure of the capacitor 1 and the capacitor 11 of FIG. 1 is shown in FIG. 3, a rear view is shown in FIG. 4, and a circuit diagram seen from the left side is shown in FIG. 3 to 5 show an example of the internal structure of the large-capacity capacitor, and the internal structure of the capacitor to which the present invention can be applied is not limited to FIGS.

  As shown in FIG. 3, the positive electrode terminal 2 is connected to the capacitor elements 5, 6, 7 via the wiring conductor 8 on the positive electrode side in the front of the inside of the capacitor 1 and the capacitor 11. The wiring conductor 8 on the positive electrode side also functions as a wiring inductance and a wiring resistance. Also, the case of the capacitor 1 in which the capacitor elements 5, 6, 7 are housed is insulating.

  As shown in FIG. 4, the negative electrode terminal 3 is connected to the capacitor elements 5, 6, 7 via the wiring conductor 9 on the negative electrode side on the back surface inside the capacitor 1 and the capacitor 11. The wiring conductor 9 on the negative electrode side also functions as a wiring inductance and a wiring resistance.

  As shown in FIG. 5, in the internal circuit of the capacitor 1 and the capacitor 11, capacitor elements 5, 6 and 7 are connected in parallel between the positive electrode terminal 2 and the negative electrode terminal 3. By connecting a plurality of capacitor elements in parallel internally, the capacitances of the capacitors 1 and 11 are increased. Further, the wiring inductance and the wiring resistance also exist inside the capacitor elements 5, 6, 7.

  The positive electrode terminal 2 includes an inductance 36 and a wiring resistance 56 (theoretical configuration), a positive electrode terminal (terminal side), an inductance 37 and a wiring resistance 57 (theoretical configuration), a positive electrode terminal (intermediate), an inductance 38 and the wiring resistance 58 (Theoretical configuration), connected in the order of the other end of the positive electrode. The negative terminal 3 includes an inductance 44 and a wiring resistance 64 (theoretical configuration), a positive terminal (terminal side), an inductance 43 and a wiring resistance 63 (theoretical configuration), a positive terminal (intermediate), an inductance 42 and the wiring resistance 62 (Theoretical configuration), it is connected in the order of the other end of the negative electrode.

  In this configuration, the capacitor 5 is between the positive electrode terminal (terminal side) and the negative electrode terminal (terminal side), the capacitor 6 is between the positive electrode terminal (intermediate) and the negative electrode terminal (middle), The capacitor 7 is connected between them.

  The capacitor 5 is theoretically composed of an internal inductance 39, a resistor 59, and a capacitance 72. The capacitor 6 is theoretically composed of an internal inductance 40, a resistor 60, and a capacitance 73. The capacitor 7 is theoretically composed of an internal inductance 41, a resistor 61, and a capacitance 74.

  The effects of this embodiment will be described below. In FIG. 2, the capacitor 1 and the capacitor 11 are connected in parallel to the DC portion of the power conversion device (between the connection terminal 110 on the positive electrode side and the connection terminal 111 on the negative electrode side of the power conversion circuit).

となる。ここでL₃₁はコンデンサを複数並列接続するための正極側の配線導体１１２のコンデンサ１とコンデンサ１１を接続する部分の配線インダクタンス、L₃₂はコンデンサ１の内部インダクタンス、L₃₃はコンデンサ１１の内部インダクタンス、L₃₄は、コンデンサを複数並列接続するための負極側の配線導体１１３のコンデンサ１とコンデンサ１１を接続する部分の配線インダクタンス、C₇₀はコンデンサ１の静電容量、C₇₁はコンデンサ１１の静電容量を示す。 In FIG. 2, the resonant frequency f _1-11 of the LC parallel resonant path 120 between the capacitors 1 and 11 connected in parallel is

It becomes. Here, L ₃₁ is a wiring inductance of a portion of the positive side wiring conductor 112 for connecting a plurality of capacitors in parallel, connecting the capacitor 1 and the capacitor 11, L ₃₂ is an internal inductance of the capacitor 1, and L ₃₃ is an internal inductance of the capacitor 11. , L ₃₄ is the wiring inductance of the portion of the wiring conductor 113 of the negative electrode side for connecting a plurality of capacitors in parallel, C ₇₀ is the capacitance of the capacitor 1, C ₇₁ is the capacitance of the capacitor 11 Indicates the capacitance.

As shown in FIG. 2, by close proximity the conductive plate 4 to the condenser 1 and the capacitor 11, it is possible to reduce the internal inductance L ₃₃ of internal inductance L ₃₂ and the capacitor 11 of the capacitor 1, the resonance frequency f _1-11 The resonance frequency f _1-11 can be adjusted to the high frequency side, and can be separated from the harmonic frequency of the switching frequency component of the power conversion circuit included in the current flowing into the capacitor from the connection terminal 110 of the power conversion circuit on the positive side. The LC parallel resonance between the capacitor 1 and the capacitor 11 can prevent the current of the capacitor 1 and the capacitor 11 from becoming excessive.

  Further, by reducing the internal inductance of the capacitor 1 and the capacitor 11, it is possible to reduce the surge voltage at the time of switching of the power semiconductor element 12.

  Hereinafter, the principle by which the wiring inductance inside the capacitor 1 and the capacitor 11 can be reduced by the conductor plate 4 will be described with reference to FIG. 6 (1) is a front view of the capacitor 1 and the conductor plate 4 of FIG. 1, the current path 100 when the current flows from the positive electrode terminal 2 of the capacitor 1 to the negative electrode terminal 3 and the positive electrode terminal 2 of the capacitor 1 The magnetic flux generated by the current flowing from the lower electrode terminal 3 to the negative electrode terminal 3 shows a direction 101 (from the back side to the front side in the drawing) where the magnetic flux intersects with the conductor plate 4. The magnetic flux produced by the current flowing from the positive electrode terminal 2 to the negative electrode terminal 3 of the capacitor 1 links the conductor plate 4 from the back side to the front side of the drawing as shown in FIG. A surrounding induced current 102 is generated. The direction 103 of the magnetic flux generated by the induced current 102 is the direction to cancel the magnetic flux generated by the current flowing from the positive electrode terminal 2 to the negative electrode terminal 3 of the capacitor 1 (from the front side to the back side of the drawing) Wiring inductance can be reduced.

  The larger the induced current 102 shown in FIG. 6 (2), the larger the effect of reducing the wiring inductance of the wiring conductor 8 on the positive electrode side. The magnitude of the induced current 102 is determined by the induced electromotive force generated by the change of the magnetic flux linked to the conductor plate 4 and the resistance value of the conductor plate 4. Therefore, the conductive plate 4 is desirably copper, aluminum or the like excellent in conductivity. Further, since the induced current generated in the conductor plate 4 by the harmonics of the switching frequency component of the current flowing through the capacitor 1 flows only to the surface of the conductor plate 4 by the skin effect, the thickness thereof can be reduced The influence on the effect of the present embodiment is small.

  Further, the closer the distance between the wiring conductor 8 on the positive electrode side and the conductor plate 4 is, the higher the wiring inductance reduction effect of the wiring conductor 8 on the positive electrode side is.

  Although not shown, since the conductor plate 4 has a floating potential, the charge can be prevented from being accumulated in the conductor plate 4 by connecting the conductor plate 4 to the reference potential through the conductor or the resistor.

  The conductor plate 4 of FIG. 1 may be annular as shown in FIG. 7, and the reason will be described below with reference to FIG. FIG. 8 (1) is a front view of the capacitor 1 and the conductor plate 4 of FIG. 1, the current path 100 when the current flows from the positive terminal 2 of the capacitor 1 to the negative terminal 3 and the positive terminal 2 of the capacitor 1. The magnetic flux produced by the current flowing from the lower electrode terminal 3 to the negative electrode terminal 3 is directed in the direction 140 (from the front side to the rear side of the drawing) through the inside of the ring of the annular conductor plate 4. The magnetic flux generated by the current flowing from the positive electrode terminal 2 to the negative electrode terminal 3 of the capacitor 1 passes through the inside of the ring of the annular conductor plate 4 from the front side to the back side of the paper surface, as shown in FIG. A counterclockwise induced current 141 is generated on the conductor plate 4 of FIG. The direction 142 in which the magnetic flux generated by the induced current 141 passes through the ring of the annular conductor plate 4 is the same as that of the ring of the annular conductor plate 4 generated by the current flowing from the positive electrode terminal 2 to the negative electrode terminal 3 of the capacitor 1. Since it is opposite to the passing direction 140 (inside of the paper from the front side to the back side), the magnetic flux generated by the current flowing from the positive electrode terminal 2 to the negative electrode terminal 3 of the capacitor 1 is canceled and the wiring inductance of the wiring conductor 8 on the positive electrode side It can be reduced.

  By arranging the capacitor 1 close to the capacitor 1 and surrounding the capacitor 1 as shown in FIG. 9, not only the wiring inductance of the wiring conductor 8 on the positive electrode side but also the wiring inductance of the wiring conductor 9 on the negative electrode side can be reduced. The internal inductance reduction effect of the capacitor 1 by the conductor plate 4 can be enhanced. Of course, by arranging the conductor plate 4 close to the capacitor 11 and surrounding the capacitor 11, the same effect can be obtained for the capacitor 11.

  The high frequency current flows to the capacitor 1 by arranging the conductor plate 4 of FIG. 1 in parallel with the portion connecting the capacitor element 5 of the wiring conductor 8 on the positive electrode side to the capacitor element 7 as shown in FIG. In this case, current concentration on the capacitor element 5 can be alleviated. The reason will be described later.

  In FIG. 5, when the high frequency current flows to capacitor 1, the current path from positive electrode terminal 2 to negative electrode terminal 3 via capacitor element 5 (assuming that the impedances of capacitor elements 5, 6, 7 are all equal) Since the impedance is the smallest, the high frequency current is concentrated on the capacitor element 5.

  As a measure for alleviating the concentration of the high frequency current to the capacitor element 5, the current path from the positive electrode terminal 2 to the negative electrode terminal 3 via the capacitor element 6 and the current from the positive electrode terminal 2 to the negative electrode terminal 3 via the capacitor element 7 It is conceivable that the impedance of the path approaches the impedance of the current path from the positive electrode terminal 2 to the negative electrode terminal 3 via the capacitor element 5.

  In FIG. 10, the impedance of the current path from the positive electrode terminal 2 through the capacitor element 6 to the negative electrode terminal 3 and the impedance of the current path from the positive electrode terminal 2 through the capacitor element 7 to the negative electrode terminal 3 Wiring inductance of the part connecting capacitor element 6 from capacitor element 5 of wiring conductor 8 on the positive electrode side to approximate the impedance of the current path leading to negative electrode terminal 3 and reduce the concentration of high frequency current to capacitor element 5 37 (see FIG. 5) and the wiring inductance 38 (see FIG. 5) in the portion connecting the capacitor element 6 to the capacitor element 7 are reduced.

  From the following, using FIG. 11, the wiring inductance 37 of the portion connecting the capacitor element 5 to the capacitor element 6 of the wiring conductor 8 on the positive side in FIG. 10 and the wiring inductance 38 of the portion connecting the capacitor element 7 to the capacitor element 6 in FIG. The principle that can reduce As shown in FIG. 11 (1), by arranging the conductor plate 4 in proximity to and in parallel with the portion connecting the capacitor element 5 of the wiring conductor 8 on the positive electrode side to the capacitor element 7, the wiring conductor on the positive electrode side on the conductor plate 4 The magnetic flux produced by the current flowing in the portion connecting the capacitor element 5 to the capacitor element 7 of 8 interlinks with the conductor plate 4 from the back side to the front side of the drawing, as shown in FIG. Because a magnetic flux is generated in the direction in which the induced current 102 cancels it (from the front side to the back side of the drawing), the wiring inductance 37 of the portion connecting the capacitor element 5 to the capacitor element 6 of the positive side wiring conductor 8 (see FIG. 5) And the wiring inductance 38 (see FIG. 5) of the portion connecting the capacitor element 6 to the capacitor element 7 can be reduced. Naturally, the capacitor element when the high frequency current flows to the capacitor 11 by closely arranging the conductor plate 4 in parallel with the portion connecting the capacitor element 5 from the capacitor element 5 of the wiring conductor 8 on the positive electrode side of the capacitor 11 The current concentration to 5 can be alleviated.

  Thus, since the wiring inductance inside the capacitor can be reduced, the wiring inductance inside the capacitor is adjusted, and the resonance frequency of the LC parallel resonance path between parallel capacitors when multiple capacitors are connected in parallel flows from the power conversion circuit to the capacitor Since the capacitor can be separated from the harmonic frequency of the switching frequency component of the power conversion circuit included in the current, it is possible to prevent the capacitor current from becoming excessive due to the LC parallel resonance between the parallel capacitors.

In the second embodiment, an embodiment of the present invention will be described using FIGS. 1 and 12.

  FIG. 12 shows an example of the mounting structure of the second embodiment of the power conversion device 13 according to the present invention.

  In FIG. 12, the power conversion circuit 10, the capacitor 1 and the capacitor 11 are connected in parallel by the wiring conductor 112 on the positive side for connecting a plurality of capacitors in parallel and the wiring conductor 113 on the negative side for connecting a plurality of capacitors in parallel An example is shown in which the conductor plate 4 is disposed close to the wiring conductor 112 on the positive electrode side for connecting a plurality of capacitors in parallel and the wiring conductor 113 on the negative electrode side for connecting a plurality of capacitors in parallel.

The effect of the second embodiment is that, as shown in FIG. 12, the conductor plate 4 is connected to the wiring conductor 112 on the positive electrode side for connecting a plurality of capacitors in parallel and the wiring conductor 113 on the negative electrode side for connecting a plurality of capacitors in parallel. By arranging them in close proximity, wiring inductance L ₃₁ (see FIG. 1) of the portion connecting capacitor 1 and capacitor 11 of wiring conductor 112 of the positive electrode side for parallel connection of a plurality of capacitors and a negative electrode for parallel connection of a plurality of capacitors it is possible to reduce the wiring inductance L ₃₄ of the portion connecting the capacitor 1 and the capacitor 11 of the wiring conductor 113 side (see FIG. 1), to adjust the resonant frequency f _1-11 to the high frequency side, the resonance frequency f _1-11 Is drawn from the harmonic frequency of the switching frequency component of the power conversion circuit included in the current flowing into the capacitor from the connection terminal 110 of the power conversion circuit on the positive electrode side. Since it is Succoth, it is that it can prevent the current of the capacitor 1 and the capacitor 11 becomes excessive by LC parallel resonance between the capacitor 1 and a capacitor 11.

  The capacitor 1 and the capacitor 11 of the wiring conductor 113 of the negative side wiring conductor 113 for parallel connection of a plurality of capacitors and the wiring inductance of the portion connecting the capacitor 1 and the capacitor 11 of the positive side wiring conductor 112 for parallel connection of a plurality of capacitors. Since the wiring inductance of the part which connects these can be reduced, the surge voltage at the time of switching of the semiconductor element 12 for electric power can be reduced.

  In FIG. 12, the insulator 130 is inserted between the wiring conductor 112 on the positive electrode side for parallel connection of a plurality of capacitors and the wiring conductor 113 on the negative side for parallel connection of a plurality of capacitors and the conductor plate 4 and insulation therebetween I keep the sex.

Reference Signs List 1 capacitor 2 positive terminal 3 negative terminal 4 conductor plate 5 capacitor element 6 capacitor element 7 capacitor element 8 positive side wiring conductor 9 negative side wiring conductor 10 power conversion circuit 11 capacitor 12 power semiconductor element 30 connecting a plurality of capacitors in parallel Wiring inductance 31 of a portion connecting the capacitor 1 and the connection terminal 110 on the positive electrode side of the power conversion circuit of the wiring conductor 112 on the positive electrode side 31 Capacitor 11 and capacitor 11 of the wiring conductor 112 on the positive side for connecting a plurality of capacitors in parallel Inductance of the part connecting
32 Internal inductance 33 of capacitor 1 Internal inductance 34 of capacitor 11 Wiring inductance of the portion of connecting conductor 113 of the negative side wiring conductor 113 for connecting a plurality of capacitors in parallel Wiring inductance 35 of a portion connecting capacitor 11 A negative electrode for connecting a plurality of capacitors in parallel Wiring inductance 36 in the portion connecting the negative side connection terminal 111 of the side wiring conductor 113 to the power conversion circuit of the power conversion circuit and the capacitor 1 Wiring inductance 37 in the portion connecting the positive electrode terminal 2 of the wiring conductor 8 on the positive side and the capacitor element 5 Wiring inductance 38 of the part connecting the capacitor element 5 and the capacitor element 6 of the side wiring conductor 8 Wiring inductance 39 of the part connecting the capacitor element 6 and the capacitor element 7 of the wiring conductor 8 on the positive side Wiring inductance 40 of the capacitor element 5 The Wiring inductance 41 of the capacitor element 6 Wiring inductance 42 of the capacitor element 7 Wiring inductance 43 of the portion of the wiring conductor 9 on the negative electrode side connecting the capacitor element 6 and the capacitor element 7 Capacitor element 5 and the capacitor element 6 of the wiring conductor 9 on the negative side The wiring inductance 44 of the portion connecting the wiring 50 The wiring inductance 50 of the portion connecting the negative terminal 3 of the wiring conductor 9 on the negative side and the capacitor element 50 The positive electrode of the power conversion circuit of the wiring conductor 112 on the positive side for connecting a plurality of capacitors in parallel Wiring resistance 51 of the portion connecting the connection terminal 110 on the side and the capacitor 1 Wiring resistance of the portion connecting the capacitor 1 and the capacitor 11 of the wiring conductor 112 of the positive electrode side for connecting a plurality of capacitors in parallel
52 Resistor 53 of capacitor 1 Resistor 54 of capacitor 11 Wire resistance of the portion of the wiring conductor 113 of the negative electrode side for connecting a plurality of capacitors in parallel The wiring resistor 55 of a portion connecting the capacitor 11 11 Wiring resistance 56 of the part connecting the connection terminal 111 on the negative electrode side of the power conversion circuit of the wiring conductor 113 and the capacitor 1 56 Wiring resistance 57 of the part connecting the positive electrode terminal 2 of the wiring conductor 8 on the positive side and the capacitor 5 Wiring resistor 58 in the portion connecting the capacitor element 5 of the wiring conductor 8 and the capacitor element 6 Wiring resistor 59 in the portion connecting the capacitor element 6 and the capacitor element 7 of the wiring conductor 8 on the positive side Resistance 60 of the capacitor element 5 Capacitor element 6 Resistor 61 capacitor element 7 resistor 62 negative pole side wiring conductor 9 capacitor element 6 Wiring resistor 63 in the portion connecting the capacitor element 7 Wiring resistor 64 in the portion connecting the capacitor element 5 and the capacitor element 6 of the wiring conductor 9 on the negative side connect the negative terminal 3 of the wiring conductor 9 on the negative side and the capacitor element 5 Part wiring resistance 70 Capacitance 1 Capacitance of capacitor 1 Capacitance of capacitor 11 Capacitance of capacitor element 5 Capacitance of capacitor element 6 Capacitance of capacitor element 6 Capacitance of capacitor element 7 100 From positive terminal 2 of capacitor 1 Current path 101 when current flows toward the negative electrode terminal 3 Direction in which magnetic flux generated by current flowing from the positive electrode terminal 2 to the negative electrode terminal 3 of the capacitor 1 links the conductor plate 4 102 induced current 103 induced current 102 Direction 110 of the magnetic flux generated by the connection terminal 111 connection terminal on the positive side of the power conversion circuit Connection terminal 112 on the negative side of the power conversion circuit Conden Wiring conductor 113 on the positive electrode side for parallel connection of a plurality of wires Conductor 114 on the negative electrode side for parallel connection of a plurality of capacitors AC terminal 115 of power conversion circuit 10 AC terminal 116 of power conversion circuit 10 AC terminal of power conversion circuit 10 117 Output terminal 118 on the positive electrode side Output terminal 120 on the negative electrode side LC parallel resonant path 130 between the capacitor 1 and the capacitor 11 Insulator 140 Direction 141 passing in the ring of the conductor plate 4 Induction current 142 Direction in which magnetic flux generated by the induction current 141 passes inside the ring of the annular conductor plate 4 AC power supply 302 AC power supply 303 AC power supply 304 AC reactor 305 306 AC reactor 307 load

Claims (10)

In a power conversion device configured by connecting a capacitor element to a semiconductor element, the capacitor element is constituted by a plurality, and a wiring conductor on a positive electrode side connecting the positive electrode of the plurality of capacitor elements, and the plurality of capacitor elements A wiring conductor on the negative electrode side connecting the negative electrodes of the above, and a conductor plate is disposed close to either one or both of the wiring conductor on the positive electrode side and the wiring conductor on the negative electrode side,
The conductive element is disposed outside the case of a capacitor in which the capacitor element, the wiring conductor on the positive electrode side, and the wiring conductor on the negative electrode side are housed in an insulating case, and the positive electrode terminal and the negative electrode terminal are provided outside the case. Power converter characterized in that.   The power conversion device according to claim 1, wherein a plurality of the conductor plates are provided, and the plurality of conductor plates are disposed close to each other.   The power converter according to claim 1, wherein the conductor plate surrounds the capacitor.   The power converter according to claim 1, wherein a plurality of the capacitors are connected in parallel. 5. The power conversion device according to claim 4, wherein a plurality of the conductor plates are disposed in proximity to a part or all of the plurality of capacitors connected in parallel. The power converter according to claim 4, wherein a part or all of the plurality of capacitors connected in parallel are surrounded by a conductor plate. The power converter according to any one of claims 1 to 6, wherein the conductor plate is annular.  The power converter according to any one of claims 1 to 7, wherein the conductor plate is covered with an insulator.   The power conversion device according to any one of claims 1 to 8, wherein the conductor plate is grounded to a reference potential.   The power converter according to any one of claims 1 to 9, wherein the conductor plate is resistively grounded to a reference potential.

Images